{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "Application of Ultra - Performance Liquid Chromatography / Mass Spectrometry - Based Metabonomic Techniques to Analyze the Joint Toxic Action of Long - Term Low - Level Exposure to a Mixture of Organophosphate Pesticides on Rat Urine Profile ."}
{"Chemical": ["Organophosphate"]}